A Teleconverter increases the focal length (which means the Field of View changes also) by whichever TC you use, so for example a 50mm with a 2x would effectively make it a 100mm lens (if you use a cropped camera like the K3II, you would include the crop factor, which would make the FL longer)
To increase the reproduction ratio to get a 1:1 (life size) or to 2:1 (which is greater than life size, which is getting into the microphotography world) you would need extension tubes.
For example, a normal 50mm would need 50mm worth of Extension Tubes to make it a 1:1 macro lens, if you add more extension tubes you would make it greater than life size.
If your using a lens that's already a true macro (like the 100mm macro), when you add extension tubes of any length your making it Greater Than Lifesize. (2:1)
Here's a link from B&H that will explain it more in detail. (The B&W videos are very interesting to watch & learn stuff, by the way)
Last edited by disconnekt; 07-14-2016 at 10:43 PM.